
class Book {
    public String name;//书名
    public static int age;
    private static int num;
    private static boolean good;
    public static void look() {
        System.out.println("今天又看了5页书");
    }
}
public class Object {
    public static void main(String[] args) {
        Book book = new Book();
        book.name = "Abook";
        Book.age = 18;
        System.out.println(Book.age);

        System.out.println(book.name);
        Book.look();
    }


}
